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A Sinusoidal Stripe Field Projection Module Based on Liquid Crystal Film

A technology of sinusoidal stripes and negative films, applied in the field of 3D measurement, can solve the problems of troublesome realization of phase shift, difficult to guarantee transmittance, and high production cost, and achieve the effects of low cost, convenient control and simple structure.

Active Publication Date: 2021-12-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to manufacture the standard transmissive sinusoidal grating film, mainly because the transmittance is difficult to guarantee. At present, the main production method is photolithography, and the production cost is relatively high. mechanical movement to achieve

Method used

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  • A Sinusoidal Stripe Field Projection Module Based on Liquid Crystal Film
  • A Sinusoidal Stripe Field Projection Module Based on Liquid Crystal Film
  • A Sinusoidal Stripe Field Projection Module Based on Liquid Crystal Film

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the embodiments.

[0017] This embodiment provides a sinusoidal fringe field projection module based on a liquid crystal film, the structure of which is as follows figure 1 As shown in the figure, it includes: a backlight source 1, a liquid crystal film 2, a projection imaging lens 3, an expansion lens 4 and an electrode group control circuit 5; wherein, all electrode patterns on the liquid crystal film can be divided into three binary sinusoidal filling patterns by grouping. display; as figure 2 As shown, the electrode pattern is formed by dividing three identical sinusoidal waveforms stacked together. These three sinusoidal waveforms are placed along the X direction and have a 120° phase shift relationship, so all electrode patterns are added together to form a rectangular pattern, That is, the liquid crystal film is rectangular; the "triangle-like" area formed between the sinusoidal waveform ...

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Abstract

The invention belongs to the technical field of 3D measurement, and provides a sine fringe field projection module based on a liquid crystal film, which is particularly suitable for use in miniaturized 3D measurement equipment; The projection imaging lens and extension lens project sinusoidal fringes, avoiding the problem of inaccurate transmittance in the production of transmissive sinusoidal gratings, and at the same time greatly reducing the production cost; the combination of electrode selection allows the liquid crystal negative to display three images that meet the 120° phase. The binary filled sinusoidal pattern of the shift relationship is obtained, so that three sinusoidal fringe fields satisfying the three-step phase shift are obtained through time-division control, and the phase shift relationship is accurate. The present invention has simple structure control and small size, and is especially suitable for 3D measuring equipment requiring miniaturization of the whole machine; meanwhile, based on simple structure and control and low-cost components, the cost of the projection module of the present invention is much lower than that of the DFP projection method.

Description

technical field [0001] The invention belongs to the technical field of 3D measurement, and mainly relates to a 3D measurement technology using sinusoidal stripe structured light, in particular to a sinusoidal stripe field projection module based on a liquid crystal film. Background technique [0002] Structured light 3D measurement equipment projects structured light to the target to be measured, shoots the target with a camera, and realizes 3D measurement by processing the captured pictures; 1. The 3D topography measurement technology using sinusoidal fringe projection and phase shift method has the advantages of high resolution and high precision, and has been widely used in many fields. Sinusoidal fringe projection technology is one of the core technologies of phase-shift 3D measurement, and it has also undergone a long-term research process. In the early days, a grating lamp film with sinusoidal transmittance was used as a projection film to generate sinusoidal fringes,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/25
CPCG01B11/254G01B11/2545
Inventor 彭仁军岳慧敏田明睿杨立峰张靖
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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